21641411 has 8 divisors (see below), whose sum is σ = 24247344. Its totient is φ = 19141920.

The previous prime is 21641393. The next prime is 21641467. The reversal of 21641411 is 11414612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21641411 - 2¹⁴ = 21625027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21641311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26180 + ... + 26993.

It is an arithmetic number, because the mean of its divisors is an integer number (3030918).

Almost surely, 2^21641411 is an apocalyptic number.

21641411 is a deficient number, since it is larger than the sum of its proper divisors (2605933).

21641411 is a wasteful number, since it uses less digits than its factorization.

21641411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53221.

The product of its digits is 192, while the sum is 20.

The square root of 21641411 is about 4652.0329964436. The cubic root of 21641411 is about 278.6731912488.

The spelling of 21641411 in words is "twenty-one million, six hundred forty-one thousand, four hundred eleven".